Question

The graph shows the amount of time that Dewayne spent on a practice exam based on the number of questions he completed. What is the function rule? How much time will he spend if the actual exam has twenty questions?

A graph shows number of questions along the x-axis and total time in minutes along the y-axis. The graph of the ordered pairs two comma ten, four comma twenty, and six comma thirty

Answer 1

do you have to write the function rule as something like f(x) = mx + b ?

Answer 2

I dont have a function rule i am just starting geometry I am not that great :P

Answer 3

a. y equals x divided by two; one hundred minutes
b. y equals five times x; four hundred minutes
c. y equals x divided by five; four hundred minutes
d. y equals five times x; one hundred minutes

Answer 4

my options..:P

Answer 5

ohhh
so y = mx + b
where m = slope and b= y-intercept
do you know what slope is? :)

Answer 6

no o:

Answer 7

slope is the rise over run :)

rise
---
run

like how much does the graph go up when you move to the right 1 unit?

Answer 8

oh..ok

Answer 9

so looking at the graph, can you tell me you think the slope is? :)

Answer 10

(2,10)

Answer 11

not quite :)
it goes up 10 when it goes to the right 2
so rise = 10
and run = 2
so rise/run = 10/2 = slope
so slope = 5
do you see that? :)

Answer 12

Ohhhhh okay I see now.

Answer 13

good :)
so in the equation I showed before, y = mx + b
where m = slope
we now know that slope = 5
so we can replace m with 5
so y = 5x

Answer 14

so d?? o:

Answer 15

correct